oecumenical vs oecumenism

oecumenical is not a noun while oecumenism is a noun.

Word	Noun	Adjective	Verb	Adverb
oecumenical	No	Yes	No	No
oecumenism	Yes	No	No	No

oecumenical (noun)	oecumenism (noun)
	a movement promoting union between religions (especially between Christian churches)

oecumenical (adjective)	oecumenism (adjective)
of worldwide scope or applicability
concerned with promoting unity among churches or religions